Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Synthesis and characterization of the high-entropy alloy CrMnFeCoNi obtained by mechanical alloying
Submission Author:
Athos Fernandes Araujo , SC
Co-Authors:
Felipe Martina André, Claudio Poffo, Daniel Cunha, Athos Fernandes Araujo, Catarina Meiko Hayashi
Presenter: Athos Fernandes Araujo
doi://10.26678/ABCM.COBEM2023.COB2023-2406
Abstract
High entropy alloys are a class of metallic materials that had their studies boosted in the early 2000s, where they showed interesting properties when compared to more common metal alloys. These alloys are composed of multiple elements in concentrations ranging from 5-35% with the presence of at least 5 different elements. The present work aimed to synthesize a high entropy alloy composed of Chromium, Manganese, Iron, Cobalt, and Nickel in equiatomic proportions, through high-energy mechanical alloying and characterize its physical and chemical properties. The alloy was subjected to X-ray diffraction (XRD) tests to evaluate the structural evolution, where it was found that after 5 hours of milling, the material presents a predominantly face-centered cubic crystal structure and a minor body- centered cubic structure. After 10 hours of milling, the material remained with the same crystal structure but with a higher concentration of defects in its structure, highlighting the high structural stability for the high entropy alloy. Photoacoustic Absorption Spectroscopy (PAS) tests were performed to calculate the thermal diffusivity of the material. The results showed a trend of decreasing thermal diffusivity with increasing grinding time. Differential Scanning Calorimetry (DSC) tests were conducted on the material at different grinding times. It was found that no intense exothermic or endothermic event occurred in the temperature range of the test (40-530ºC), indicating the thermal stability of the material.
Keywords
High entropy alloy, Grinding, crystallinity, Thermal difusivity
